What skills are needed to craft a small fort or bunker ?

[Lastoutkast]

^^^

[alexd1976]

Profession: Stonemason would likely cover it.

[Vratix]

Knowledge (Engineering) for the design and Craft (Stonemasonry) or (Carpentry) for the actual building, depending on whether you want a stone or wood building.

[Lastoutkast]

Awesome, and mines, traps and a possible torret ?

[Wrath]

I'd say as long as you can throw a few dozen pillows around and toss a heavy blanket over it all pretty much anyone can build a pretty cool fort.

[Val'bryn2]

Craft (Trapmaking) for traps, (Alchemy) for mines, likely, and (Weapons) for various siege weapons.